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Solution: Let the terms be a/r , a , and ar Therefore the product is a^3 = 3375 Therefore a=15 Sum= a/r + r + ar = 58.5 =15/r + 15 + 15r = 58.5 15 + 15r + 15r^2 = (58.5)r 15r^2 -43.5r +15 = 0 r= 2.5 or 0.5 Hence series is 6, 15, 37.5 or 37.5, 15, 6 If the...

why not do chemistry to the death?

Okay solve this: (i'll post the answer later.) Three numbers are consecutive terms in a geometric series. Their sum is 58.5 and their product is 3375. i) Write down a relationship (using the symbols a and r) which shows that the numbers are consecutive terms in a geometric series...

yea. i know. But i was just pointing out how letters could be used to make number systems greater than base 10.

Me too. :(

Don't worry, i don't like biology very much either. :D

this is what i drive in my imaginative journeys.

oh i see now. I was wondering about why 1- lnx/x^2=0 became 1-lnx=0! It's (1-lnx)/x^2=0. lol, i should have realised that sooner. :D

isn't your HSC in 2010?

remember how we have units, tens, hundreds, thousands... well, for the units, it can be a number 0-9, and for tens it can be a number 0-9, and same for hundreds and thousand. What if instead of numbers we used a-z. So we could have 26 letters in the units, 26 letters in the tens, 26 in...

good question. I was wondering about that myself... e is a constant. type it into your calculator, or google it. it's irrational. so it goes on forever.

Not 26 numbers. Base 26 number system a-z. Our decimal system is base 10, 0-9.

not only that, ask different teachers to explain stuff to you. What a different teacher might say might just click for you. Jacaranda and Macmillan are my favourite physics books. :D

y'= (lnx) + 1 -2x y''=(1/x) -2 at y''=0 0=(1/x) -2 2=1/x 2x=1 x=1/2 You find the x by letting y'' =0 <!-- / message --><!-- sig -->

naa, thats different i think. There was a question with 5 parts for physics, i didn't know how to do the first part, and all other 4 parts needed that first part, so i jsut made up an answer so i could do the other 4 parts. the mistake in the first part is only marked wrong once, and thats the...

y=xlnx -x^2 differentiating using product rule because x.lnx is a product of x and lnx u=x u'=1 v=lnx v'=1/x dy/dx = u'v+uv' - d/dx (x^2) dy/dx = 1.(lnx) +x.x - 2x dy/dx = 1.(lnx) + 1 -2x

I guess, you could make a base 26 number system out of letters...

Lol, everytime i just say i hurt my leg, so i dont' run. :D I'm clearly lazier. :D

I can do every question. :D What I get wrong is stuff like forgetting the +C after integrating, or not seeing something when collecting like terms, or writing stuff like -2-3=5 ! :burn:

I tried and i failed. :(